The worked crash

A composite of the early twenty-first-century mortgage crises. No jurisdiction named.

Provenance at issuance. Records were written against future capacity the borrowers could not supply. Underwriting was contracted. Lenders sold the risk on and stopped reading it. Borrowers’ override was compromised by housing costs the structure had been writing across classes. Failing at issuance.

Propagation. The failing records were bundled and sold on to buyers whose reading of them was compromised. Rating standards contracted. Models that treated the tail as absent. Regulators not reading where the risk lived. The room was contracting where nobody was looking.

Suppression. Valuations were allowed to depart from capacity for an extended duration. The buffer filled.

Compressed audit. Valuations collapsed. Credit became unsupportable in compressed time. Liquidity froze. Institutions the whole structure ran on faced insolvency.

The slope. The cost landed on classes whose corridors the structure had already been narrowing.

Two corrections, independent. At the harm-doers — the issuers, the packagers, the supervisors. And at the slope — the structure’s own responsibility for where the cost landed. Neither substitutes for the other.

This is the short edition of Ø Applications — a summary. Where a step is compressed here, the original carries it in full. The original book (PDF) · This edition (PDF)

The same page on the420code.org: the420code.org/models/applications/04-the-architecture-of-economics/